Sash Balance?

A handy person from Fort Mitchell, KY says:
May 8, 2017
I have two different sash balances, both have 11600-17, however one (for a shorter height window) has 519, the other nothing.

On the 519 balance - the tab for attaching to the window frame has "J53 6 89"
On the blank balance - the tab for attaching has "727 2 06 1089"

The 519 balance only has a 16" sash cord, the other has over 20"

Both are the exact same dimensions
User submitted photos of a window balance.
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Tom from SWISCO responded:
May 11, 2017
Thank you for posting. For your sash balance marked with "519," we recommend you taking a look at our 24-531 Andersen sash balance. As for the balance marked with "727," please see our 24-737 sash balance.
A quick learner from Fort Mitchell, KY says:
May 11, 2017
I was a quicker leaner than I thought. Two hours after I sent you the questions...I figured it out and ordered 4 24-531 and 4-737, that were delivered today!
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Tom from SWISCO responded:
May 12, 2017
Great! Glad to hear it. Thanks for ordering with us, and please let us know if you ever need anything else.
Andersen Sash Balance, 725, 727, 731, 737
Andersen Sash Balance, 725, 727, 731, 737
24-737
$54.20
Andersen Sash Balance, 519, 523, 525, 527, 531
Andersen Sash Balance, 519, 523, 525, 527, 531
24-531
$54.20
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